Beta-Aroylacrylic acids (1a-d) react with primary amines and secondary amines to give the corresponding alpha-alkylamino-beta-propionic acids (2a-r) and (3 a-h). Treatment of (2c) and/or (2e) with acetic anhydride gave the butenolide (4) and the ketone (5). Reaction of (4) with phenylhydrazine gave the phenylhydrazone (6). Reaction of (2e) with hydrazine and/or phenylhydrazine gave the pyridazinone derivatives (7a and b).
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